Lines Matching defs:alpha
27 * \brief Functions to apply alpha test.
78 _mesa_problem(ctx, "Invalid alpha test in _swrast_alpha_test" ); \
86 * Perform the alpha test for an array of pixels.
88 * \return 0 if all pixels in the span failed the alpha test,
89 * 1 if one or more pixels passed the alpha test.
111 /* Use array's alpha values */
131 /* Interpolate alpha values */
135 GLfixed alpha = span->alpha;
138 ALPHA_TEST(FixedToInt(alpha), alpha += alphaStep);
142 GLfixed alpha = span->alpha;
145 ALPHA_TEST(FixedToInt(alpha), alpha += alphaStep);
149 GLfloat alpha = FixedToFloat(span->alpha);
151 ALPHA_TEST(alpha, alpha += alphaStep);